CVE-2026-46319

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_ct: Only release RCU read lock after ct_ft When looking up a flow table in act_ct in tcf_ct_flow_table_get(), rhashtable_lookup_fast() internally opens and closes an RCU read critical section before returning ct_ft. The tcf_ct_flow_table_cleanup_work() can complete before refcount_inc_not_zero() is invoked on the returned ct_ft resulting in a UAF on the already freed ct_ft object. This vulnerability can lead to privilege escalation. Analysis from zdi-disclosures@trendmicro.com: When initializing act_ct, tcf_c...

Affected product and versions

Product

Linux Linux, linux kernel

Affected versions

>= 138470a9b2cc2e26e6018300394afc3858a54e6a < ece578ca61e572df96cfc80456357ebfae0b4b9e, >= 138470a9b2cc2e26e6018300394afc3858a54e6a < a2e0c045c87aa252eb61412e67dd91f2c2b19f81, >= 138470a9b2cc2e26e6018300394afc3858a54e6a < 67c9ecc9f2575273ed1323e312881fc98ac83d6d, >= 138470a9b2cc2e26e6018300394afc3858a54e6a < f23424a0ddadb494d4bd57056a7ca703312d3a7b, >= 138470a9b2cc2e26e6018300394afc3858a54e6a < 17dfb67cb399b660105d9a8c6100851c0d0cdc70, >= 138470a9b2cc2e26e6018300394afc3858a54e6a < 4c727c6967a41b37efe0f26332ca9ec5b74785a3, >= 138470a9b2cc2e26e6018300394afc3858a54e6a < 3e20e1b3058e0b94638e7b931c138e840e266724, >= 138470a9b2cc2e26e6018300394afc3858a54e6a < f462dca0c8415bf0058d0ffa476354c4476d0f09, >= 5.7, >= 5.7 < 5.10.258, >= 5.11 < 5.15.209, >= 5.16 < 6.1.175, >= 6.2 < 6.6.141, >= 6.7 < 6.12.91, >= 6.13 < 6.18.33, >= 6.19 < 7.0.10

Fixed versions

5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10

Technical data

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-416